空气分离_烟气再循环技术基础研究进展

分离回收矿物燃料燃烧产生CO2的技术被认为是近期内减缓CO2排放的较为可行的措施。在众多CO2分离回收技术中,空气分离/烟气再循环技术(O2/CO2燃烧技术)具有明显的优势和较强的应用前景。本文介绍了全球CO2的排放情况,总结了空气分离/烟气再循环技术的提出背景和研究现状,并重点阐述了O2/CO2气氛下煤粉燃烧及各种污染物(SO2、NOx及超细颗粒物)的排放特性,指出了目前研究的不足之处和存在的问题。O2/CO2气氛下煤粉燃烧速率低,火焰发暗且燃烧不稳定,污染物生成及钙基脱硫剂的脱硫规律与传统方式存在明显差异,研究O2/CO2气氛下煤粉的燃烧特性及多种污染物的协同控制机理,将是今后工作的重点。

Latest Advances in Fundamental Research on Air-separation/Flue Gas Recycling Technology

The technology for separation and recovery of carbon dioxide produced during fossil fuel combustion is regarded as a comparatively feasible measure to alleviate CO2 emissions in the near future. Among the numerous CO2 separation and recovery technologies, air separation/flue gas recycling technology (O2/CO2 combustion technology) has an evident edge and a relatively favorable application prospect. The overall situation of CO2 emissions worldwide is described and the background for proposing the air separation/flue gas recycling technology outlined along with its latest research findings. The emphasis has been put on the exposition of pulverized coal combustion in the environment of O2/CO2 and the emission characteristics of various contaminants (SO2, NOx and super fine particles).The shortcomings and problems existing in the current research are also pinpointed. The pulverized-coal combustion rate in the environment of O2/CO2 is low, featuring a kind of unstable burning and a darkening flame. The formation of pollutants and the desulfuration mechanism of a calcium-based desulfurizing agent clearly differ from those of traditional cases. To study the combustion characteristics of pulverized coal in the environment of O2/CO2 and concerted control mechanism of various pollutants will be a main focus for future work.